| 41. |
- Hassona, Ahmed Adel, 1988, et al.
(författare)
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Demonstration of +100-GHz Interconnects in eWLB Packaging Technology
- 2019
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Ingår i: IEEE Transactions on Components, Packaging and Manufacturing Technology. - 2156-3985 .- 2156-3950. ; 9:7, s. 1406-1414
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents waveguide interconnects implemented in an embedded wafer level ball grid array (eWLB) packaging technology. The interconnects operate at D-band (110–170 GHz), hence are enabling the realization and commercialization of high-data-rate systems. The interconnects rely on implementing radiating structures on the technology’s redistribution layers instead of using conventional ball grid arrays for the transmission of the RF signal to/from the package. The interconnects interface with standard WR-6.5 waveguides. Moreover, they do not require any galvanic contacts with the waveguide. The interconnects achieve a measured insertion loss of 2.8 dB over a bandwidth of 33%. The adopted eWLB packaging technology is suitable for low-cost high-volume production and allows heterogeneous integration with other technologies. This paper proposes cost-effective high-performance interconnects for THz integration, thus addressing one of the main challenges facing systems operating beyond 100 GHz.
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| 42. |
- Hassona, Ahmed Adel, 1988, et al.
(författare)
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F-band Low-loss Tapered Slot Transition for Millimeter-wave System Packaging
- 2019
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Ingår i: 2019 49th European Microwave Conference, EuMC 2019. - 9782874870552 ; , s. 432-435
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Konferensbidrag (refereegranskat)abstract
- This work presents a packaging solution at F-band (90 - 140 GHz) using on-chip waveguide transition. The transition is realized using a Linearly Tapered Slot (LTS) implemented in a commercial Gallium Arsenide (GaAs) Monolithic Microwave Integrated Circuit (MMIC) technology. The LTS is mounted in the E-plane of a split-block waveguide module and fed through a microstrip line. The transition is experimentally verified using a back-to-back test structure and it exhibits an average insertion loss of 1.7 dB over the frequency range extending from 100 to 135 GHz. This work presents an on-chip packaging technique to realize the interface between MMICs and standard waveguides at millimeter-wave (mmW) frequencies and hence addressing one of the main integration challenging facing systems operating at that range.
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| 43. |
- Hassona, Ahmed Adel, 1988, et al.
(författare)
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Packaging Technique of Highly Integrated Circuits Based on EBG Structure for +100 GHz Applications
- 2020
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Ingår i: 14th European Conference on Antennas and Propagation, EuCAP 2020.
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Konferensbidrag (refereegranskat)abstract
- This work presents an on-chip packaging concept suitable for monolithic microwave integrated circuits (MMIC) operating above 100 GHz. The concept relies on using an on-chip transition that couples the signal to a standard air-filled waveguide. The proposed solution utilizes an electromagnetic band-gap (EBG) structure realized using bed of nails to prevent the propagation of parallel plate modes and improve the coupling between the MMIC and the waveguide. The technique shows an average insertion loss of only 0.6 dB across the frequency range 110 - 155 GHz. Moreover, the concept is demonstrated in a D-band amplifier circuitry that is fabricated in an indium phosphide (InP) double heterojunction bipolar transistor (DHBT) technology. Experimental results show that the amplifier exhibits a maximum gain of 18.5 dB with no sign of propagation of any parallel plate modes. This work presents a verified solution for packaging high-frequency integrated circuits, and hence paves the way towards higher system integration above 100 GHz.
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| 44. |
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| 45. |
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| 46. |
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| 47. |
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| 48. |
- Jenei, Zsolt, 1978-, et al.
(författare)
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Phase diagram of nitrogen: in-situ Raman spectroscopy investigation
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- In this paper we confirm the existence of previously reported θ molecular phase of nitrogen and present in-situ Raman spectra of different molecular phases of nitrogen at temperatures over 900 K at 100 GPa pressure. Our investigation indicate very high transition barrier between ε and θ phases, θ being accessible only from previously quenched samples. Our experimental results indicate a “steeper" slope of δ/ε phase boundary than the extrapolation of previously determined phase line.
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| 49. |
- Jonsson, Leif, 1945-
(författare)
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Organisering av politiskt arbete : en studie av vitalisering av kommunfullmäktiges arbete i en svensk kommun
- 2002
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Politikerförakt, misstro och en känsla av bristande effektivitet många känner sig inte delaktiga i sin kommuns politiska liv. Hur förnyar man det politiska arbetet för att komma tillrätta med dessa problem? Vi får följa vad som hände när en kommun Motala organiserade sitt politiska arbete för att kunna vitalisera kommunfullmäktige, och stimulera och utvecklamedborgardialoger. Exemplet Motala visar att man kan skapa möjligheter för medborgare att bli delaktiga och för fritidspolitiker att finna mening i rollen som politiker det går att utveckla en långsiktig politik för kommuners utveckling. Studien identifierar ett antal faktorer som är viktiga vid organisering av politiskt arbete. Det är inte bara strukturella faktorer, utan i minst lika hög grad processuella, dvs. hur man går tillväga. En av de viktigaste slutsatserna är att kommuner behöver organiseras så att de olika delarna fullmäktige och nämnder/styrelser, politiker och verksamhetsansvariga chefer inte fungerar som skilda världar, utan som en helhet.
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| 50. |
- Martín, Carlos, et al.
(författare)
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Enhancing saccharification of cassava stems by starch hydrolysis prior to pretreatment
- 2017
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Ingår i: Industrial crops and products (Print). - : ELSEVIER SCIENCE BV. - 0926-6690 .- 1872-633X. ; 97, s. 21-31
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Tidskriftsartikel (refereegranskat)abstract
- Chemical characterization of cassava stems from different origin revealed that glucans accounted for 54-63% of the dry weight, whereas 35-67% of these glucans consisted of starch. The cassava stems were subjected to a saccharification study including starch hydrolysis, pretreatment with either sulfuric acid or 1-ethyl-3-methylimidazolium acetate ([Emim]OAc), and enzymatic hydrolysis of cellulose. Starch hydrolysis prior to pretreatment decreased sugar degradation, improved enzymatic convertibility of cellulose, and increased overall glucan conversion. Glucan recovery after pretreatment of starch-free cassava stems (SFCS) was around 85%, but below 52% when the stems were pretreated under the same conditions without preparatory starch hydrolysis. The total amount of hydrolyzed glucan after cellulose hydrolysis was two-fold higher for pretreated SFCS than for directly pretreated stems. Pretreatment with [Emim]OAc resulted in 20% higher glucan conversion than pretreatment with acid. Pyrolysis-GC/MS, X-ray diffraction, CP/MAS C-13 NMR and FTIR analyses revealed major differences between H2SO4- and [Emim]OAc-pretreated material.
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